Allwinner A20 User Manual download pdf (Page 23)

image especially if you have ordered a version of the board without NAND memory. It is also

recommended to use Class 10 (10MByte/sec) card for faster read/write operations, lower class cards

(especially higher capacity ones) might slow down the whole system.

microSD card connector

Pin # Connector signal name Wire name (processor pin)

1 DAT2/RES SD0-D2 (K19)

2 CD/DAT3/CS SD0-D3 (K20)

3 CMD/DI -

4 VDD -

5 CLK/SCLK SD0-CLK(L20)

6 VSS2 -

7 DAT0/DO SD0-D0(M19)

8 DAT1/RES SD0-D1(M20)

6.2.2 SD/MMC slot

The schematic related to the SD/MMC1 (SD/MMC connector) is shown below:

The SD/MMC2 slot is located on the back of the PCB and works with the “larger” SD and MMC

cards. The connector was mounted to to popular demand.

Note that by default this connector is not suitable for booting OS. Such support is possible but not

implemented in the official software releases.

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Allwinner A20 User Manual Page 23